Malicious PDF — malware analysis report

Static analysis result for SHA-256 34cb88a51729a7d5…

MALICIOUS

PDF

151.9 KB
MD5: 0f5d42aa99b17eabddc19a46013b517b SHA-1: 7f3def64dc5cdbd90b4917ae513ed39f159114bd SHA-256: 34cb88a51729a7d54d6e575ae14e184b25ee581ee15bc60775251909d63bd477
238 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell

The PDF file contains embedded JavaScript and exploits the CVE-2009-4324 vulnerability, as indicated by the 'media.newPlayer' heuristic. The ClamAV detection 'Pdf.Exploit.Agent-30100' further confirms its malicious nature. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, although the exact functionality is obfuscated. The presence of multiple PDF-specific heuristics and a polyglot child PDF strongly suggests a malicious exploit document.

Heuristics 8

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (matched in decompressed stream)
  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • ClamAV: Pdf.Exploit.Agent-30100 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-30100
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0052_000.js
45fea71ee6347153ec3719ebc3910509cd6fa568f263c29e7474c694308f5c7d		 pdf-javascript-stream PDF /JS object 52 at offset 0x3F4E 301 bytes
javascript_obj0057_001.js
86821d7edcc8142fc94d3635e99ccf3c8781bfa43bd3ee98de9716f6ee24a490		 pdf-javascript-stream PDF /JS object 57 at offset 0x5500 2523 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).
stream_005_off00000b74.bin
e4217c167299ac63f64b8b7e903cc0196f0828693d273431b8b793a12ed0fed3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB74 1000 bytes
objstm_0053_00.bin
f9797d0fa28384c30d8bf1da89163104ce539753e417fa1f9c5fd135d1eceb39		 pdf-objstm-decoded PDF /ObjStm 53 0 obj (inflated) 50 bytes
polyglot_child_pdf_off0001f38c.pdf
855359b65e6fabf5763aec98f210c98b571385507b5b8915290e8c28346b634d		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1F38C 27691 bytes

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